stunthanger.com
Building Tips and technical articles. => Building techniques => Topic started by: Leester on May 28, 2011, 07:12:12 PM
-
I'm building the Blackhawk Models Sig Fokker DVII profile and was wondering from those that have built one, did you put any tip weight in ??? Nothing is mentioned on the plans and I'm about to finish up the covering. This is a real Hoot to build, reminds me of the old hobby shop days at Millington. I've got it set up for a OS 30 S.
-
You gotta have tip weight.
Put in a box. The recommendation that I go by is to start with tip weight that equals or exceeds half the weight of your lines. I suspect that the rule is different with a biplane whose line guides aren't at the wing tips, but I'm no expert -- I'd put in a box and experiment until things worked.
-
I'm building the Blackhawk Models Sig Fokker DVII profile and was wondering from those that have built one, did you put any tip weight in ??? Nothing is mentioned on the plans and I'm about to finish up the covering. This is a real Hoot to build, reminds me of the old hobby shop days at Millington. I've got it set up for a OS 30 S.
Lee,
A flying buddy and I built the Spad and Fokker from BHM. Power was an LA 25 and that was more then enough for the models. Both had 1/2 oz of outboard weight., The CG was right on for both of them and they had a 9/4 prop and 10/22 Powermaster fuel. Both flew exactly the same. Which is to say exactly like the old Sig models that I remember seeing as I didn't have one.
Take off is easy and accomplished in short order. With the 25 and relatively modest weight it is aeobatic enough to be fun. Landing is another thing. High drag means no full circle glide and they have a tendency to flip over if not landed correctly. On asphault that results in small pebble burns on the covering and is to be avoided at all costs.
Now I know that someone is going to hurry up and write how a fameous west coast flyer got a 500 point flight with one. I'm not him nor is anyone else that I know and they all had about the same results.
Oh, but it is a hoot to fly, just keep it over grass.and yes, I did land on the wheels 99% of the time.
Dennis
-
For that model, assuming it's built as straight as can be, I'd stick a half ounce out there and call it good. y1
-
Thanks for the reply's, I'll stick the 1/2 oz in there.
-
Should be plenty of weight. I had the SIG Spad and a fellow club member the the Fokker. As stated they are great little planes for playing. The club at the time was going to have a combat series with them. But when only a few people build it is hard to do. By the way the young man with the Fokker was flying his like you would fly a Bi-Slob. We were both using Fox .35 Stunts. H^^
-
Hi Lee,
I had a Sig Fokker for a long time. I used 1/4 oz. "egg" fishing weights, one on the top wing and one on the bottom. Lots of fun, not a full blown stunter, but would do most of what you would like, and it liked to fly on the fast side. Used .015 X 58' and flew about 4.5 laps. Mine had a McCoy .35 RH and was good for about 5 minutes with the tank I used, a Perfect of some sort! LOL!! Landings, as has been mentioned, can be "fun". ;D Ended up giving it to a guy who was coming back into C/L and didn't have much experience. He put a Fox .35 on it and flew it for a long time. Always wondered what it would do with a Veco .19BB up front.......
Bill
-
Antone Kephart built one and let me fly it at VSC a few years ago. He powered it with a McCoy .29. I think. Dreadful model for competition, but it did stagger through the whole pattern. Scored over 400 points and won the "Most Unusual" trophy. #^ I think that if you really cheated the structure with a hollow fuselage, molded leading edge, sheet trailing edge and whatever else you can think of, it would be OK for Classic. Get enough weight out, especially in the tail, and you could use a smaller motor for still less weight. With a strong .15 (diesel?) and light enough, it ought to perform well.
-
Built one of these with a throttle and a Fox 40... it was the first plane I learned to hover and it really built my confidence for flying carrier. Had a blast with it till I dumped it a few times too many and broke the wings off... parts are in the basement and maybe I will get it back together sometime for airshow work again. At one point there were a lot of biplanes being flown by the Milwaukee club in demos. Nothing like having 6 or 7 in the air at once!
Bob